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New exploration discoveries in a mature basin: offshore Denmark

By
Graham Goffey
Graham Goffey
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UKPresent address: Soliton Petroleum Consulting Ltd, 4 Baronsfield Road, London TW1 2QU, UK
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Mark Attree
Mark Attree
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UKPresent address: Solaris Exploration Ltd, Yew Cottage, Cackle Street, Nutley, Uckfield, East Sussex TN22 3DY, UK
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Paul Curtis
Paul Curtis
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UK
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Fiona Goodfellow
Fiona Goodfellow
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UKPresent address: Edison E&P UK Ltd, 1 Cavendish Place, London W1G 0QF, UK
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Jeremy Lynch
Jeremy Lynch
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UKPresent address: SCDM Energy Ltd, 50 Cannon Street, London EC4N 6JJ, UK
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Dave Mackertich
Dave Mackertich
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UKPresent address: Saudi Aramco, PO Box 5000, Dhahran 31311, Saudi Arabia
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Tobore Orife
Tobore Orife
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UK
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William Tyrrell
William Tyrrell
PA Resources UK Ltd, 80 Hammersmith Road, London W6 9SF, UK
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Published:
January 01, 2018

Abstract

In 2011, two discoveries were drilled by PA Resources in the Danish sector. The Broder Tuck 2/2A wells were drilled on a thrusted anticlinal structure, downdip of the apparently small U-1X gas discovery. The wells found an excellent quality gas reservoir within an interpreted Callovian lowstand incised valley containing braided fluvial and marginal-marine sandstones. A top and base seal are provided by mudstones of the over- and underlying transgressive systems tracts respectively. The development of a base seal is key to the presence of a potentially commercial resource downdip of a relatively unpromising old well.

The Lille John 1/1B wells were then drilled on a salt diapir on which 1980s wells had encountered shallow oil shows. Lille John 1 found slightly biodegraded 34° API oil in Miocene sandstones at the uncommonly shallow depth of −910 m true vertical depth subsea (TVDSS). The reservoir is full to spill, whilst the trap developed intermittently through latest Miocene–Late Pleistocene times. It is interpreted that a deeper Chalk accumulation temporarily lost seal integrity owing to glacially induced stress or overpressure triggering top-seal failure or fault reactivation during and after latest Pleistocene diapir inflation. The wider hydrocarbon exploration implications of glaciation on stress, pore pressure and trap integrity appear to be underappreciated.

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Geological Society, London, Special Publications

Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference

M. Bowman
M. Bowman
University of Manchester, UK
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B. Levell
B. Levell
University of Oxford, UK
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The Geological Society of London
Volume
8
ISBN electronic:
9781786203151
Publication date:
January 01, 2018

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